using System;
using System.Collections;
using System.Text;
using iTextSharp.text;
/*
 * Copyright 2003 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

namespace iTextSharp.text.pdf {
    /** Selects the appropriate fonts that contain the glyphs needed to
    * render text correctly. The fonts are checked in order until the 
    * character is found.
    * <p>
    * The built in fonts "Symbol" and "ZapfDingbats", if used, have a special encoding
    * to allow the characters to be referred by Unicode.
    * @author Paulo Soares (psoares@consiste.pt)
    */
    public class FontSelector {
        
        protected ArrayList fonts = new ArrayList();

        /**
        * Adds a <CODE>Font</CODE> to be searched for valid characters.
        * @param font the <CODE>Font</CODE>
        */    
        public void AddFont(Font font) {
            if (font.BaseFont != null) {
                fonts.Add(font);
                return;
            }
            BaseFont bf = font.GetCalculatedBaseFont(true);
            Font f2 = new Font(bf, font.Size, font.CalculatedStyle, font.Color);
            fonts.Add(f2);
        }
        
        /**
        * Process the text so that it will render with a combination of fonts
        * if needed.
        * @param text the text
        * @return a <CODE>Phrase</CODE> with one or more chunks
        */    
        public Phrase Process(String text) {
            int fsize = fonts.Count;
            if (fsize == 0)
                throw new ArgumentException("No font is defined.");
            char[] cc = text.ToCharArray();
            int len = cc.Length;
            StringBuilder sb = new StringBuilder();
            Font font = null;
            int lastidx = -1;
            Phrase ret = new Phrase();
            for (int k = 0; k < len; ++k) {
                char c = cc[k];
                if (c == '\n' || c == '\r') {
                    sb.Append(c);
                    continue;
                }
                if (Utilities.IsSurrogatePair(cc, k)) {
                    int u = Utilities.ConvertToUtf32(cc, k);
                    for (int f = 0; f < fsize; ++f) {
                        font = (Font)fonts[f];
                        if (font.BaseFont.CharExists(u)) {
                            if (lastidx != f) {
                                if (sb.Length > 0 && lastidx != -1) {
                                    Chunk ck = new Chunk(sb.ToString(), (Font)fonts[lastidx]);
                                    ret.Add(ck);
                                    sb.Length = 0;
                                }
                                lastidx = f;
                            }
                            sb.Append(c);
                            sb.Append(cc[++k]);
                            break;
                        }
                    }
                }
                else {
                    for (int f = 0; f < fsize; ++f) {
                        font = (Font)fonts[f];
                        if (font.BaseFont.CharExists(c)) {
                            if (lastidx != f) {
                                if (sb.Length > 0 && lastidx != -1) {
                                    Chunk ck = new Chunk(sb.ToString(), (Font)fonts[lastidx]);
                                    ret.Add(ck);
                                    sb.Length = 0;
                                }
                                lastidx = f;
                            }
                            sb.Append(c);
                            break;
                        }
                    }
                }
            }
            if (sb.Length > 0) {
                Chunk ck = new Chunk(sb.ToString(), (Font)fonts[lastidx == -1 ? 0 : lastidx]);
                ret.Add(ck);
            }
            return ret;
        }
    }
}